Problem Component K2

Good morning
I installed the K2 component for joomla, downloading it from the official website and I also downloaded and installed the Italian language files but the back-end remains in English and also this warning:

Warning: count(): Parameter must be an array or an object that implements Countable in....

remains both in back and in front end. Can you help me?

I solved the translation problem, the warning remains though

also solved the warning by changing the php version from 7.2 to 7.1 thanks

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